ooples token-optimizer-mcp up to 5.0.x Dashboard HTTP Server /api/session-summary path.join sessionId path traversal

Summaryinfo

A vulnerability marked as problematic has been reported in ooples token-optimizer-mcp up to 5.0.x. Affected is the function path.join of the file /api/session-summary of the component Dashboard HTTP Server. Performing a manipulation of the argument sessionId results in path traversal. This vulnerability is known as CVE-2026-55156. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in ooples token-optimizer-mcp up to 5.0.x. It has been classified as problematic. This affects the function path.join of the file /api/session-summary of the component Dashboard HTTP Server. The manipulation of the argument sessionId with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

Token Optimizer MCP measures token savings per AI coding agent, optimizes context, and shares a live local knowledge graph across 16 CLI clients. Prior to version 5.1.0, the dashboard HTTP server in token-optimizer-mcp exposes /api/session-summary and /api/session-events with no authentication middleware — any network-accessible client can reach them without credentials. Both handlers concatenate the caller-supplied sessionId query parameter directly into a filesystem path via path.join, and Node.js normalizes .. segments at resolution time, allowing an unauthenticated attacker to read any .jsonl file reachable from the server's filesystem. This issue has been patched in version 5.1.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-55156 since 06/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 5.1.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• ooples

Name

• token-optimizer-mcp

Version

• 5.0

Website

• Product: https://github.com/ooples/token-optimizer-mcp/

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